Tenacious D

Foo Fighters leader previously jammed with Geddy Lee and Alex Lifeson at Taylor Hawkins Tribute Concerts.

Get 'em headbanging while they're still young!

All-star team-up was part of VictimsFirst benefit show thrown by Judd Apatow.

Jack Black and Kyle Gass' comedy rock group has performed dozens of classic tracks over the years.

Comedic rock duo cover three 'Tommy' songs to benefit charity.

Dewey gets congratulated by the kids.